There are actually people who haven't yet seen it. And, they may want to put it on a concert DVD. I don't think it helps the band at all to have the leaked videos posted. I hope they don't. A lot of people's time, work, and creativity went into making that film and they should all get their fair share.

The videos are still everywhere on the internet, but everytime they appear they're quickly removed. (Try tumblr, tumblr is really good at spreading leaked things and then not doing anything about that)

The videos that leaked are standalone with title cards, in the movie they were woven together and had some added sounds. So I dunno how they'll go about that on a release, personally I'd prefer the movie if there's only one way to go.